单项选择题

It's really time I went home but I'm enjoying myself, so I here a bit longer.

A．am staying
B．have stayed
C．stayed
D．stay
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单项选择题
--I've just dropped in to say hello to you.--Well, __________.
A．it's a pleasure
B．pleased to see you again
C．that's very nice of you
D．that's all right
单项选择题
Antarctica, as the world's coldest continent, isn't easily ______.
A．to reach
B．reaching
C．reached
D．reach
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